From the course: Advanced C#: Functional Programming Patterns

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Example of an impure function

Example of an impure function - C# Tutorial

From the course: Advanced C#: Functional Programming Patterns

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Example of an impure function

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In this example, we'll look at a useful function, but it's considered impure from the functional programming perspective. So the code is in this method called GetCurrentTimeRoundedUpToCustomMinuteInterval. So I'm passing in a value of four minutes of interval time, and it'll take my system clock on my computer and take the current time, and round it up to the nearest minute based on this interval. So when I run it on my computer at the moment, I can see it's 8:07 on my clock and it's rounded it up to 8:08. And when this gets to 50 and when it gets to 60, I should say we're back to zero. We'll see this value change. Now it's rounded it up to the next four-minute interval. And it would be 16 after that, and so on. Now this is a useful function perhaps for your application. But it's impure because given the same value of four, I get back different results. And the reason why is easy to see when you take a look at the function itself, it's over here. Here's the inbound parameter called…

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